One of the most important concepts of eyesight is depth perception. Depth perception is what allows humans to distinguish 3-D objects from one another, and is what has helped humans evolve through time. In order to understand depth perception and how it develops in humans at a young age, experiments have been created to test this skill. Some tactics used are called ‘visual cliffs’, which are apparatuses that look like cliffs but are actually just small drop-offs. These cliffs cause no harm to the participant. If the participant is able to tell that there is a drop off, then they will avoid the edge of the cliff. However, if participants are unable to see the depth in the drop off, then they will walk on the glass where they would drop off. This experiment is used at different age groups to tell when depth perceptions comes into play throughout development. This experiment was also used to test depth perception of animals, including goats, chicks, dogs, rats, and lambs. The results of this experiment do not explain whether depth perception is a learned or innate skill; only some children walked across the cliff, and others were hesitant or did not at all. However, through other experiments it is evident that children must learn to understand depth perception through their experiences.
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